Barking drum



J. D. ULLGREN BARKING DRUM Jan. 29, 1929. 1,700,390

Filed Abril 20, 1928 Ill 1h veil/or Joban Danie/ll ran Patented Jan. 29, 1929.

UNITED STATES mane earner oFFIcE.

JOHAN DANIEL ULLGREN, OF STOCKSUND, SWEDEN BARKIN G DRUM.

Application filed April 20, 1928, Serial No. 271,461, and in Sweden April 25, 1927.

Rotary horizontal barking drums have hitherto as a rule been made cylindrical along their entire length, and have been rovided at the ends with plane walls, w iich have usually been built stationary immediately outside the ends of the drum. Owing to the fact that the charge of wood logs in the drum reaches over its centre line it has not been possible to place the inlet opening centrally in the wall, since at the receiving end the wall must reach above the horizontal line through the axis of the drum, and owing to the fact that during the operation of the drum the logs occupy an oblique or slanting position in the drum as viewed from one end thereof, the wall at the receiving end must reach still higher at one side of the vertical line through the axis of the drum; and therefore, the inlet opening must be located opposite the one upper quadrant of the receiving end of the drum. Since naturally a horizontal cylindrical drum can not itself effect the feeding of the wood from the receiving end to the discharge end, such drums have been made slightly inclined towards the discharge end, which arrangement, however, makes the construction as well as the operation more expensive, or the interior of the drum has been provided with feeding means, for in stance obliquely placed ribs, or bars which, however, have proved to damage the wood.

According to the present invention the horizontal rotary barking drum is provided at the receiving end with a charging cone extending outside the drum proper and tapering outwards towards the axis of rotation, said cone being provided with a central inlet opening in its outer free end. This arrangement provides for a very considerable simplification of the apparatus. Tests have proved that the said conical member takes care of the feeding-in of the wood logs introduced through the central inlet opening and of the conveying of the logs through the drum, and consequently, it is not necessary to build a wall. outside the receiving end of the drum, nor is it necessary to make the drum inclined, or to provide the same with. feeding means on its inner surface.

The arrangement also provides another very essential advantage as against the barking drums heretofore used. Such drums are as a rule supported by whole supporting rings, which are secured outside the shell of i the drum, and which run on supporting much more simple and less expensive to secure the same. A second supporting ring for the drum is secured at the other or discharge end of the drum, and serves simultaneously as an end wall of the drum at said end, so that said second supporting ring may also be made smaller and be secured in a siiqpler manner than that heretofore pos- S1 e.

An embodiment of a barking drum according to the present invention is illustrated by way of example in the accompanying drawing, in which Fig. 1 shows the drum in side elevation and partly in section, Fig. 2 shows an end view of the receiving end, and Fig. 8 shows an end view of the discharge end. Fig. 4: shows to a larger scale a cross section of the drum at the water outletin the same.

In the embodiment illustrated, the drum proper consists of a horizontal cylindrical shell 1 of sheetmetal for instance, which is provided at one end,the receiving end, with a portion or extension 2 conically tapering outwards towards the axis of the drum. Said portion or extension is cut off or truncated On the outside of the cone 2, preferably at its 9 end, a supporting ring t and a toothed ring 5 are secured, said rings being, for instance, attached to a cast iron sleeve 6 riveted to the cone. The supporting ring & rests and runs on supporting rollers 7 which are journalled in a support 8 at this end of the drum, and the toothed ring 5 meshes with a toothed pinion 9 which is also journalled in the support 8 and which is driven in any suitable manner, said pinion serving to rotate the barking drum. At the opposite end, the discharge end, of the drum the shell of the drum is secured to a second support-ing ring 10 which forms sinoultaneously' an end wall of the drum at this end, this fgiurpose,

in the embodiment illustrated, an annular plate 11 is secured to said ring 10, the central opening of said plate forming the discharge opening 12. The supporting ring 10 is carried by rollers 13 which are journalled in a support 14 at this end of the barking drum. Said rollers 13 are preferably provided with flanges 15 which guide the barking drum in the axial direction. Adjacent the discharge opening 12 a stationary chute 16 is supported in suitable manner and serves to receive the discharged barked logs. A pipe 17 which is also stationary extends into said opening and serves to introduce Water in the barking drum. At the opposite end of the drum proper, that is to say, adjacent the cone 2, an outlet opening 18 for the water is provided in the shell of the drum, said opening having comparatively large dimensions so that a great quantity of water may flow out through the same once during each rotation of the drum. Inside the drum a protecting plate 19 is provided over the opening 18, as shown in Fig. 4, in such manner that when the drum rotates in the direction indicated by the arrow, said protecting plate prevents the logs in the drum from sticking or jamming in the outlet opening.

During the operation of the barking drum the logs are introduced through the inlet 3, and it has been proved by tests that the cone 2 eiiects the feedingin and the forwarding of the woodthrough the drum and keeps the inlet empty, so that the wood may be introduced continuously. The approximate position of the wood in the drum is indicated by the dotted and dashed line 20. The water introduced in the drum through the pipe 17 flows through the interior of the drum in the opposite direction to the wood and consequently, at the discharge end the wood will be washed with clean water so that the discharged wood is free from bark. In view of the fact that only one outlet opening of large dimensions is provided for the bark and the water, a large quantity of water will be discharged during a short moment of time once during each revolution of the drum, whereby the washing is rendered much more effective than when, as heretofore usual, the water is allowed to flow oii continuously.

It will be understood that the invention is not limited to the exact embodiment above described and illustrated in the drawing. The conical shape of the receiving end is of course also applicable to such "barkingdrums the shells of which are vnot whole but are formed of parallel ribs or bars.

I claim:

1. In a horizontal rotary barking drum the combination of a drum proper, and a charging cone at the receiving end "of the drum proper, said charging cone extending outside the drum proper and tapering outwards towards the axis of rotation, said cone having a central inlet opening in its outer free end.

2. In a horizontal rotary barking drum the combination of a drum proper, a charging cone at the receiving end of the drum pro-per, saidchairging cone extending outside the drum proper and tapering outwards towards the axis of rotation, said cone having a central inlet opening in its outer free end, and supporting rings attached to the ends of the drum, saidsuppor ting rings having a less diameter than the diameter of the drum proper.

In a horizontal rotary barking drum the combination of a drum proper, a charging cone at the receiving end of the drum proper said charging cone extending outside the drum proper and tapering outwards towards the axis of rotation, said cone having a central inlet opening in its outerfree .end, and a supporting ring secured to said charging cone and having a less diameter than the diameter of the drum proper.

4. In a horizontal rotary barking drum the combination of a drum proper, a charging cone at the receiving end of the drum proper, sa id charging cone extend-ing outside the drum proper and tapering outwards towards the axis of rotation, said cone having a central inlet opening in its outer free end, a supporting ring secured to said charging cone, and a toothed ring secured. to said chargin'g cone, said rings havinga less diameter than the diameter of the drum proper.

5. In a horizontal rotary barking drum "the combination of a drum proper, a charging cone at the receiving end of the drum proper, said charging cone extending outside the drum proper and tapering outwards towards the axis of rotation, said cone having a central inlet opening in its outer free end, a supporting ring secured to said charging cone, a toothed ring secured to said charging cone, said rings having-a less diameter than the diameter of the drum proper, and. a second supporting ring secured to the discharge end of the drum proper, said second supporting ring having a less diameter than the diameter of the drum proper and forming an end wall of the drum proper.

'6. In a horizontal rotary barking drum, the combination of a drum proper having a whole shell and having :a receiving end and a discharge end, means for introducing water into the drum at its discharge end, and an outlet opening for the water in the drum shell near the receiving end of the drum.

(7. In a horizontal rotary barking drum, the combination of a drum proper having a whole shell, a charging cone at the receiving end of the drum proper, said. charging cone extending outside the druni' proper and tapering outwards towards the axis of rotation, said cone having a central inletopening in its outer free end, means for introducing Water into the drum at its discharge end, and an outlet opening for the water in the drum shell near the receiving end of the drum.

8. In a horizontal rotary barking drum, the combination of a drum proper having a whole shell, a charging cone at the receiving end of the drum proper, said charging cone extending outside the drum proper and v tapering outwards towards the axis of rotation, said cone having a central inlet opening in its outer free end, means for introducing water into the drum at its discharge end, an outlet opening for the water in the drum shell near the receiving end of the drum, and a protecting plate over said outlet opening Within the drum.

J OHAN DANIEL ULLGREN. 

